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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 03-04-2012, 05:58 PM   #1
Drewfus2101
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2800 RPM dip w/ Euro2 tune? Do I reflash?

I've always had the ~2800 RPM dip, even after I flashed my DME to the Euro2, which was months ago.

I'm starting to wonder why that didn't fix it and if there is something else I can do to fix it.

I found an SIB that says the fix is to use Progman and update the DME to the latest version with DISv39 or later.

I know my Progman is v32, but I have no idea what version the daten files are. I'm guessing they are good enough.

The Euro2 tune didn't fix the problem, but would I be better off just using Progman and letting it pick the best DME flash and upgrade the DME? Once that's done, I'll just drive around with the CEL on for a while (SAP and Cats) and see if it fixes the 2800 RPM dips.

If it does, would there be any benefit to then flashing back to the Euro2 tune? Anyone else with a Euro tune have the 2800 RPM dip problem? Did you have it before?
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Old 03-04-2012, 06:59 PM   #2
jfoj
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I maybe wrong on this, but my understanding is that there was a flash for the ZHP engines that BMW was doing on a case by case basis for a similar performance issue, but maybe at slightly higher engine RPM's??

The thing that confuses me it why after 6+ years is BMW releasing a new flash for these engines?? What was wrong with the original flash? What problem or issues are they trying to resolve?

It was my take that the DME flash issue is with a problem with the ignition timing prematurely retarding under heavy engine load. I think that maybe BMW felt that long term carbon build up in the combustion chambers may have contributed to the ignition retarding after 6+ years and many miles?? I also heard that there was an issue where under certain circumstances that the DISA was actually rattling at a low enough frequency to trigger the knock sensors?

Well there may be a way to take the DISA noise triggering the knock sensor out of the equation temporarily by unplugging the DISA, drive the car and see what happens. I believe?? I cannot recall what the DISA does when unplugged, but you may see a different performance issue show up, however your 2800 RPM dip may be different or non existent? Its worth a try to see what happens, as I say it does not cost anything! It probably will trigger a CEL for DISA circuit open?

Also I understand the DISA part number has been superseded and the new part number was to possibly combat noisy DISA problems causing issues with retarding the ignition timing and maybe some other changes. Not 100% sure this is totally accurate, but there may be some truth to this??

On the last note, I will know for sure the next week or so, parts just arrived Friday, that there may be some problems with BMW knock sensors aging and becoming overly sensitive and falsely retarding the ignition timing. I have been chasing a problem with one of my cars for over 1 year and I am both hopeful and fairly confident that I have identified and found the issue with faulty knock sensors. I believe that faulty knock sensors and/or noisy DISA may trigger shadow knock sensor codes, shadow engine too noisy codes and possibly shadow crank sensor codes. This is my observation, still do not have enough hard data to back up my findings yet.

So it I were you, if the car has never had a DISA replaced, I would first replace the DISA, then consider replacement knock sensors and I would also consider VANOS seals as well.

Hope this gives you some ideas and some things to think about.

Good luck.
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Old 03-05-2012, 08:27 AM   #3
Drewfus2101
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Thanks for the input.

I did read that the dip has something to do with the O2 sensors reading too slow or the knock sensors maybe. No one is really sure. The 2800 RPM dip and the 4000 RPM 'surge' ZHP problem are often mixed together, so it's pretty confusing.

I have replaced the DISA in the past year or so. Just pulled it out to put on the new O-ring, and it still looks good.

The O2 sensors are less than a year old too.

The knock sensors have not been replaced though. I might look into those.

I have changed the VANOS seals in the last year. It didn't seem to fix the problem.

Interestingly, the temp dropped by 30* here, and it stopped doing the 2800 RPM dip. So that tells me that it's related more to knock, as I know that is affected by intake air temp and ignition.

I may still try to update the DME to the latest US version and see what happens. It will only cost me some time. I'll see if I can find a more recent Euro DME version as well.
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Old 03-07-2012, 01:31 PM   #4
Mc 007
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interesting
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Old 03-31-2013, 10:03 PM   #5
Mouf
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Check the official thread. Several reported fixes. I posted mine on page 7.

http://www.e46fanatics.com/forum/sho...d.php?t=966614
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